These 8 unusual very large images (about 6500 by 4500 pixels) JPG.files, preserving details and lettering, date from 1920. It was an attempt by the Alpha Portland Cement Company to promote the use of concrete and cement in building. The file size is 55MB. Do not be fooled by the size shown in this listing, much more detail is available from the CD. The images would be ideal to produce large quality prints.